Added required changes to index file and added readme file.

index.js

@@ -2,7 +2,11 @@ const express = require('express')
 const app = express()
 const port = 3001
 
-const USERS = [];
+const USERS = [
+  {
+    email: "xyz@abc.com",
+    password: "2193#$%^" }
+];
 
 const QUESTIONS = [{
     title: "Two states",
@@ -14,60 +18,105 @@ const QUESTIONS = [{
 }];
 
 
-const SUBMISSION = [
-
-]
+const SUBMISSION = []
+app.use(express.json());
 
 app.post('/signup', function(req, res) {
   // Add logic to decode body
   // body should have email and password
-
+  const { email,password } = req.body
 
   //Store email and password (as is for now) in the USERS array above (only if the user with the given email doesnt exist)
+  const ExistingUser = USERS.find((user)=>user.email==email)
 
-
+  // If user already exit return
+  if(ExistingUser){
+    return res.status(409).send("This email address already exists");
+  }
+  USERS.push({ email, password });
   // return back 200 status code to the client
   res.send('Hello World!')
 })
 
 app.post('/login', function(req, res) {
   // Add logic to decode body
   // body should have email and password
+  const { email, password } = req.body;
+  // checking if the email and password were included in the request body
+  if (!email || !password) {
+    return res.status(400).send("Both Email and Password required");
+  }
 
   // Check if the user with the given email exists in the USERS array
   // Also ensure that the password is the same
+  const ExistingUser = USERS.find((user)=>user.email==email && user.password === password)
 
-
+  // If the password is not the same, return back 401 status code to the client
+  if(!ExistingUser){
+    return res.status(401).send("Invalid userID or Password");
+  }
   // If the password is the same, return back 200 status code to the client
   // Also send back a token (any random string will do for now)
-  // If the password is not the same, return back 401 status code to the client
-
-
-  res.send('Hello World from route 2!')
+  const loginToken = Math.random().toString(11);
+  res.status(200).json({ loginToken });
 })
 
 app.get('/questions', function(req, res) {
-
   //return the user all the questions in the QUESTIONS array
-  res.send("Hello World from route 3!")
+  res.status(200).json(QUESTIONS);
 })
 
 app.get("/submissions", function(req, res) {
    // return the users submissions for this problem
-  res.send("Hello World from route 4!")
+   res.status(200).json(SUBMISSION);
 });
 
 
 app.post("/submissions", function(req, res) {
    // let the user submit a problem, randomly accept or reject the solution
    // Store the submission in the SUBMISSION array above
-  res.send("Hello World from route 4!")
+   const { problemId, userId, code } = req.body;
+
+   if (!problemId || !userId || !code) {
+     return res.status(400).send("Problem ID, user ID, and code are required");
+   }
+
+   const newSubmission = { id: SUBMISSIONS.length + 1, problemId, userId, code };
+   SUBMISSIONS.push(newSubmission);
+   res.status(201).json(newSubmission);
 });
 
 // leaving as hard todos
 // Create a route that lets an admin add a new problem
 // ensure that only admins can do that.
 
+// Create an array of admin user IDs
+const ADMIN_IDS = [1, 2, 3];
+
+// POST request to add a new problem
+app.post("/problems", function (req, res) {
+  const { title, description, testCases } = req.body;
+
+  // Check if the user making the request is an admin
+  const userId = req.headers["user-id"];
+  if (!ADMIN_IDS.includes(parseInt(userId))) {
+    return res.status(401).send("Only admins can add new problems");
+  }
+
+  // Check that all required fields are present in the request body
+  if (!title || !description || !testCases) {
+    return res
+      .status(400)
+      .send("Title, description, and test cases are required");
+  }
+
+  // Create a new problem object and add it to the PROBLEMS array
+  const newQuestion = { id: QUESTIONS.length + 1, title, description, testCases };
+  QUESTIONS.push(newQuestion);
+  res.status(201).json(newQuestion);
+});
+
+
 app.listen(port, function() {
   console.log(`Example app listening on port ${port}`)
 })

readme.md

@@ -0,0 +1,19 @@
+# Environment Setup
+
+    Before you begin with the assignment, you must first configure your development environment.
+
+    You will need to have the following software installed on your machine:
+        Node.js v14 or later
+        Git
+
+    To set up your development environment, please follow these steps:
+        Clone the repository using Git.
+        Open a terminal and navigate to the project directory.
+        Run npm install to install the necessary packages.
+        Running the server
+        To run the server, open a terminal in the project directory and execute node index.js. The server will begin running on localhost:3001.
+
+
+# Assignment Details
+
+    The server is a rudimentary HTTP server skeleton with a variety of routes defined. Your task is to implement the missing functionalities for the routes described in the index.js file. Specifically, you must implement the following functionalities: